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Message: <blockquote data-quote="TonyCT322" data-source="post: 126904" data-attributes="member: 19714">My John Deere did the same thing. Water pump gasket had a small leak. It would take about an hour of use before it would overheat. Drove me crazy finding it. It would boil off on the block or drip out. Once parked and shut down it stopped. Rarely had any on the ground underneath it. I found it when changing the water pump. Check your fan to ensure it is running (electric? Or mechanical- could be bad clutch. Stops under load?). Check thermostat as suggested above. I would refrain from using any kind of sealant. You might try a dye to help locate a leak.   Are you running a 50/50 mix of antifreeze. I agree airlock is a thing. My 2019 Truck has been to the dealer twice for a TSB for this and my Kubota RTV once. RTV was diagnosed with bad radiator cap (3 years old). Dealer said it allowed air into the system slowly. You've done most of the same repairs/replacements that I went through. Good news is it can be fixed. Hang in there.</blockquote>